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Team Work on Road Construction 筑 路

Dr.Ying's picture
Submitted by Dr.Ying on Fri, 04/07/2017 - 11:39

Team Work on Road Construction

Five workers together can build a road in 20 days. Suppose every worker works at the same rate. If three workers work on the road for 10 days before eleven more workers join them, then how long total will it take to build the road?

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上期答案： Sunday

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